

"Kyle Hubert, an executor from the Underworld, agrees to Old Mr. Carter's dying request: marry into the Carter family under contract and protect them for three years.Despite his silent guardianship, the Carter family treats him with contempt and betrayal, ultimately expelling him just as the protection period ends. When the Carter family faces deadly calamity once more, they finally learn the truth about Kyle’s sacrifices and desperately beg him to return."

As the Monster Age arrived and special abilities awakened, what awaited humanity was the end of the world. At the brink of the apocalypse, Frank Channing was sent back in time to the second year of the Monster Age. There, he awakened the Infinite Devouring System, allowing him to gain growth points by hunting the monsters. Along with it came a mysterious serpent-shaped mark on his arm. It could transform him into a powerful serpentine creature capable of wielding the very forces of the monster—seemingly tied to the secrets of the Blood Moon. From the system, Frank learned that he carried the mission of saving the world.